Vehicle ventilator



Patented Oct. 4, 1927.

UNITED STATES JEREMIAH T. FITE, OF SPRINGFIELD, MISSOURI.

VEHICLE VENTILATOR.

Application filed November 14, 1925; Serial No. 69,005.

The invention relates to ventilators especially adapted for use inconnection with railway cars, though applicable to any mov ing vehicle.Its principal object is to secure a high degree of efliciency.

A preferred embodiment of the invention is hereinafter described, and isillustrated in the accompanying drawings, in which Fig. 1 is a detailside elevation of the body of a railway car with the improved ventilatorapplied thereto;

Fig. 2 is a detail transverse vertical section of the car and centrallythrough the ventilator; and

Fig. 3 is a side elevation of the ventilator, partly in section and someparts being broken away.

The improved ventilator comprises a sheet metal casing 10, oblongrectangular in shape and having an opening in one of its side walls forcommunication with the interior of the car, this opening beingpreferably crossed by a screen 11. The casing 10 is open at the bottom,preferably, as indicated at 12, a bottom wall is entirely omitted.

Through each of the end Walls of the casing there enters atrun'ipet-shaped air flue 13, the contracted inner end 14 of whichterminates within the chamber of the casing and m is preferably directeddownwardly toward the open bottom thereof.

The ventilator is advantageously applied to the vertical wall 15 of thedeck of a railway car, this wall being apertured to register with thescreen opening 11. The casing 10 is provided with a lateral flange 16,adapted to fit against the wall to which the ventilator is applied andthrough which may be passed the necessary attaching screws or nails.

The flues 13 may be secured in place by any suitable means. Their innerends may be braced. as shown, by a tie-plate 17 connecting themtogether. 45 The details of the opening in the car wall will, of course,be determined by the character of the wall. As this feature is notinvolved in the invention, a mere aperture is shown. It is customary touse, in connection with car ventilators, some sort of damper forregulating the outflow, and such a device may be used in connection withthe improved ventilator.

Whether the ventilator is applied to the side wall of a car deck, or toany other portion of the car, it is so placed that the mouths of its airflues 13 are directed toward the ends of the car. The speed of thevehicle causes a rush of air into the mouth of the flue which faces inthe direction of travel and by reason of the contracted inner end of theflue air is discharged into the chamber 7 of the casing at anaccelerated velocity. By the action of the well known law that a rapidlymoving current induces a flow of fluid laterally into it, the column ofair issuing from the smaller end of the flue and passing out through thebottom of the casing carries with it the air within the chamber of thecasing and consequently induces an overflow from the interior of theVehicle. This suction action of the air column becomes highly effective,because it takes place within the chamber of the casing and consequentlymust be entirely satisfied by the contents thereof.

The flue which opens through the rearward wall of the casing has butlittle effect upon the operation of the ventilator, though tending toincrease its efliciency, as any movement of air therethrough will beout- Ward. It follows that should the ventilator be applied to a vehiclewhich moves in one direction only, the rearward flue might be omitted.

The inner ends of the air flues. are preferably, as shown, directedtoward the externa]. opening of the casing, and also preferablyterminate back of the walls of such opening. Should these flues beprolonged to bring their ends nearer to the external opening than asshown, it is. believed that the efliciency of the device would belessened, although to a much less degree than would otherwise be thecase because the flue ends are well within the area of the opening, and

consequently the suction action of the current issuing from them, beingexerted on all.

sides, will still act upon the contents of the chamber of the casing.

Changes may be made in the details of construction without departingfrom the scope of the invention. For example, while the trumpet form ofthe air flues is desirable because it will intensify the velocity of theair current asit issues from the flue, it is apparent that the devicewill function efliciently it the flue be of uniform cross-section,especially where the movement of the vehicle is at high speed.

I claim as my invention A vehlcle ventilator comprislng a casing havinga top, side and end walls, its inner side beingopen for the majorportion of its Vertical extent, means for securing said casing to theside wall of a vehicle about an opening therethrough, said casing havingitsbottorn open and unobstruete'dt a trumpet shaped air flue enteringthrough each end wall of the casing, the larger ends of said fiuesprojecting beyond the ends of the casing, the smaller.

ends of the fines terminating independently JEREMIAH T. FITE'.

